JPH0221220Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an FRP pipe with end seals, and more specifically, for use in the field of plants and hot springs that transport high-temperature solutions of acids and alkalis and high-temperature water. This relates to FPR composite pipes with end seals.

In plants, special metal pipes are used to transport high-temperature, highly concentrated acid/alkaline solutions, but they are expensive, heavy, and corrode quickly, making them less durable.

In addition, in FRP pipes, the solution in the pipe penetrates into the glass fibers from the cut end (end face) of the pipe due to capillary action, and this gradually oozes out to the outside of the FRP pipe (weeping phenomenon), causing liquid leakage. It was very dangerous because it formed the cause.

The present invention was made to solve these conventional problems, and its purpose is to provide heat resistance,
We provide FRP composite pipes coated with a sealant that has excellent acid and alkali resistance, short curing time, and good workability.FRP composite pipes with improved end faces sealed so that they can be widely used in the plant field and hot spring field. Our goal is to provide the following.

In other words, in order to achieve this objective, the FRP composite pipe with end face sealing of the present invention uses a sealing material of low molecular weight chlorosulfonated polyethylene on the end face of the FRP composite pipe that has a multilayer structure of two or more layers. The structure is such that the coating is applied and cured.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of an FRP composite pipe A showing an embodiment of the present invention, in which a core material 1 made of heat-resistant vinyl chloride resin, a glass roving 2a attached in the axial direction to the outside of the core material 1, On top of that, another long glass fiber 2b is wound in the circumferential direction, and a reinforced plastic layer 2 is formed by impregnating this with an unsaturated polyester resin and hardening it by bonding it to the core material 1, and a covering layer 3 made of a thermoplastic resin. , which are continuously pultruded while being integrally bonded together.

Then, chlorosulfonated polyethylene is applied as a sealant 4 to the end face 5 of this FRP composite pipe A and hardened.

Therefore, when connecting these FRP composite pipes A and A, the required length of the coating layer 3 at the ends of the pipes is peeled off, and a sealing material 4 made of low molecular weight chlorosulfonated polyethylene dissolved in a solvent is applied to the pipes. End face 5
After coating and curing, it is inserted into joint B and fixed with adhesive 6.

As the adhesive for this FRP composite pipe A and the joint B, epoxy resin, vinyl ester resin, etc. can be used in addition to chlorosulfonated polyethylene.

This low-molecular-weight chlorosulfonated polyethylene solution is completely cured and bonded in approximately 5 minutes after being applied to the end surface of the tube, and its workability is superior to that of silicone rubber solutions (curing time approximately 30 minutes or more). It is much better, has a high heat resistance temperature of 150℃, and is water resistant.
It has excellent acid and alkali resistance, has a smooth surface and a good finish, and has tear strength more than twice that of silicone, so it can withstand expansion and contraction caused by tube expansion and contraction, and can withstand repeated thermal stress. It has characteristics.

As a sealant, there are solution-type silicone rubber solutions and butyl rubber solutions as mentioned above, but they take a long time to harden and have poor workability, and in the case of silicone, their water resistance is not very good. It has the disadvantage of being attacked by low-concentration inorganic acids and deteriorating. Furthermore, after being applied to the pipe end surface, when it hardens, the solvent separates and evaporates, causing the overlay of the sealing part to become depressed. It cannot fully perform the sealing action.

Therefore, chlorosulfonated polyethylene dissolved in a solvent such as ketones is effective as a tube end sealing material.

FRP composite pipes include those with a three-layer structure as shown above, those with a reinforced plastic layer 2 and core material 1 as shown in Figure 2, and other types of ordinary thermoplastic pipes regardless of structure. It includes various FRP composite pipes in which reinforcing materials such as glass fiber and carbon fiber are laminated to a combination of resin and thermosetting resin.

As explained above, according to the present invention, the end surface of the FRP composite pipe is coated with a low molecular weight chlorosulfonated polyethylene solution, so even if it comes into contact with high-temperature water, high-temperature acid, or alkaline solution, the end surface of the tube remains intact. Since it is completely sealed with chlorosulfonated polyethylene, the solution in the pipe does not penetrate from the end surface of the pipe, preventing the weeping phenomenon of FRP pipes, making it safe for plants and hot springs. It can be used in

[Brief explanation of the drawing]

Figure 1 is. A cross-sectional view of an FRP composite pipe showing one embodiment of the present invention, and Figure 2 shows another embodiment.
A cross-sectional view of the FRP composite pipe. Figure 3 is a cross-sectional view showing the connection state of the FRP composite pipe and the joint. 1...Core material, 2...Reinforced plastic layer, 3...
...Covering layer, 4...Sealing material, 5...Pipe end surface,
A...FRP composite pipe, B...fitting.

Claims (1)

[Scope of utility model registration request] An FRP composite pipe that has an end face seal that is characterized by applying and curing low molecular weight chlorosulfonated polyethylene as a sealing material to the end face of an FRP composite pipe that has a multilayer structure of two or more layers.